Tomcat server does not start with DCEVM patched JRE

Question

I have followed at the steps mentioned here

1. Install “jvm.dll” DCEVM patch in JDK (Successful. DCEVM patch folder is created )
2. In Eclipse - Tomcat Server - Runtime Environment - JRE must be mapped to the same JRE of JDK in which DECVM is patched in step-1
3. Tomcat - Add “-XXaltjvm="dcevm" -javaagent:\\HotswapAgent.jar” in VM Arguments (VM Arguments -Dcatalina.base="C:\\MCA\\workspaces\\MCA\\.metadata\\.plugins\\org.eclipse.wst.server.core\\tmp0" -Dcatalina.home="C:\\MCA\\tools\\apache-tomcat-7.0.54" -Dwtp.deploy="C:\\MCA\\workspaces\\MCA\\.metadata\\.plugins\\org.eclipse.wst.server.core\\tmp0\\wtpwebapps" -Djava.endorsed.dirs="C:\\MCA\\tools\\apache-tomcat-7.0.54\\endorsed" -XXaltjvm="dcevm" -javaagent:C:\\MCA\\tools\\dcevm\\hotswap-agent.jar )
4. Disable “Auto Reload” in Tomcat web modules

Whenever I try to use an exception is thrown.

Below is the stack trace.

 HOTSWAP AGENT: 17:15:46.234 INFO (org.hotswap.agent.HotswapAgent) - Loading Hotswap agent {0.3.0-SNAPSHOT} - unlimited runtime class redefinition.
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:382)
    at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:397)
Caused by: java.lang.NullPointerException
    at org.hotswap.agent.config.PluginConfiguration.<init>(PluginConfiguration.java:44)
    at org.hotswap.agent.config.PluginManager.init(PluginManager.java:95)
    at org.hotswap.agent.HotswapAgent.premain(HotswapAgent.java:42)
    ... 6 more
FATAL ERROR in native method: processing of -javaagent failed
Exception in thread "main" 

Java - version is

java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

Installer file downloaded from here .

Answer 1

Here it is described a very similar bug caused bythe same NPE that you get:

Caused by: java.lang.NullPointerException
   at org.hotswap.agent.config.PluginConfiguration.<init>(PluginConfiguration.java:44)

The solution seems to be switching from Oracle JDK to OpenJDK.

So, if you are using Oracle JDK, try to change it. If you are already using OpenJDK, forget my answer.

Hope it helps!

Answer 2

我通过将JDK1.7_80更改为JDK1.7_55解决了这个问题。

Answer 3

当我的热交换代理路径错误时，我遇到了这个问题。